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:cry: For a couple of months had intermittent hot/cold water. Boiler keeps turning itself off. Plumber hasn't been able to fix despite cleaning heat exchanger, checked pump, removed and cleaned diverter valve, new thermostat - but no joy. Heating seems to work ok. Plumber won't return...

Dave Sounds like you have same problem as me, ie boiler keeps cutting out therefore fluctuating water temps. Our plumber been working on prob for 2 months. The only thing that made a difference, although temporary, was cleaning the divertor valve. But after 10 days it went back the way it...

For two months our plumber has been trying to solve the problem of our lack of hot water. Boiler not able to stay on, keeps firing off, therefore when running hots taps, get a steady rythem of warm/cold/warm/cold. Pump has been checked, new thermostat fixed, thermister checked and divertor...

Thanks Chris Plumber ordered thermistor and is changing pump too. Oops update since this morning. Plumber changed pump and made no difference. Now taking apart the Divertor Valve to clean and reassemble.

Hi SIME Friendly Format 80E Combi-boiler - 5 years' old For month now, boiler keeps cutting out (every few seconds). Hot water taps running lukewarm/cold/lukewarm/cold. Plumber says thermister needs changing. He operated boiler without thermister to test it, and, although kitchen tap...